custom view Horizontal list of flags (EXPOSUREAPP-3736) (#1626)

* countryList mofidication

* Country Names list implemented

* flag size adjustment

* removing hardcoded sizes and spacings

* ViewHolder changed and code cleanup

* layouts adjusted

* Finish CountryListView

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>